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=== Geology === Various [[Geology|geological]] data are rendered as contour maps in [[structural geology]], [[sedimentology]], [[stratigraphy]] and [[economic geology]]. Contour maps are used to show the below ground surface of geologic [[stratum|strata]], [[Fault (geology)|fault]] surfaces (especially low angle [[thrust fault]]s) and [[unconformity|unconformities]]. [[Isopach map]]s use '''isopachs''' (lines of equal thickness) to illustrate variations in thickness of geologic units.
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